html,body{
    height: 100%;
}
body,ul,li,h2,form,input{
    margin: 0;
}
ul{
    list-style: none;
}
body{
    font-family: '楷体';
    background-color: #f4f4f4;
}
*{
    box-sizing: border-box;
}
.header-nav{
   background-color: #f4f4f4;
   height: 39px;
   line-height: 38px; 
}
.content{
    width: 1200px;
    margin: 0 auto;
    height: 100%;
}
.header-nav ul{
    line-height: 38px;
    list-style: none;
    margin: 0;
    padding: 0;
}
.header-nav ul li{
    height: 28px;
    line-height: 26px;
    margin-top: 6px;
    border-radius: 2px;
    display: inline-block;
    padding: 0 -6px -2px 0;
}
.header-nav ul li a{
    border-radius: 2px;
}
.left li{
    float: left;
    margin-right: 15px;
    vertical-align: middle;
}
.nav{
    border: 1px solid deepskyblue;
    color: deepskyblue;
    text-decoration: none;
    display: block;
    width: 100%;
    height: 100%;
    cursor: pointer;
    font-size: 14px;
    color: deepskyblue;
    background-color: #fff;
    text-indent:29px; 
}
.jt{
    width: 94px;
    background-image: url(QQ.png);
}